落地通信基站机房地震易损性及震后功能失效概率评估

Seismic fragility and functional failure probability assessment of machine room of typical base transceiver stations that located on the ground

机房是移动通信基站的重要组成部分,其地震易损性将决定基站在震后的功能状态,即基站所辖范围内的移动通信服务在震后是否可以正常使用。在对我国北方某市典型落地通信基站机房进行实地考察的基础上,确定了影响机房地震后使用功能的重要设施(即基站板房、内部走线架、通信机柜和蓄电池组);随后采用有限元软件ABAQUS分别建立了这些设施的数值模型,通过Pushover分析确定了每种设施的损伤模式、损伤水平评价指标及其数值;通过IDA分析得到了每种设施的抗震性能,并通过对IDA分析结果的统计得到了这些重要设施的地震易损性曲线;最后,给出了基于故障树模型的典型通信基站机房震后功能评估的方法。该工作将作为基本环节用于城市及地区移动通信系统的地震后功能状态评估与预测。

Machine rooms are important part in Base Transceiver Stations （BTS） of mobile communication system. Their seismic fragility will determine the functional status of BTS, that is, whether the mobile communication service within the scope of the BTS can be used normally after an earthquake. Based on the field-study on a typical BTS in a northern city of China, the important facilities （ including steel panel room, cable tray, equipment cabinet and storage battery） affecting the functional status of BTS after earthquakes were determined. Then, the numerical models of these facilities weree stablished by using the finite element software ABAQUS. The damage modes, damage indexes and their values of each facility were determined by Pushover analysis. The seismic performance of each facility was obtained by IDA analysis, and the seismic fragility curves of these important facilities were obtained by statistical analysis of IDA results. Finally, based on fault tree model, the method evaluating functional status of BTS after earthquakes was given. The work of this paper will be used as the basic work for the evaluation and prediction of the functional status of mobile communication system of an area after earthquakes.